Call server, call terminal, call system, transfer processing method, and program storage medium storing program thereof

Abstract

A reception-process manager of a call server writes, in a transfer-voice-data storage, voice data contained in a voice packet received from the transmitter terminal which has acquired the talk right. A transmission-process manager of the call server determines the next transmission interval of a voice packet for each receiver terminal on the basis of determination information received from the each receiver terminal. The transmission-process manager reads out the voice data in a size dependent on the determined transmission interval from the transfer-voice-data storage, generates voice packet containing the voice data for the each receiver terminal, and transmits the voice packet to the each receiver terminal. Thus, the voice-packet transmission interval can be changed for each receiver terminal without stopping voice-packet transmission.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a system for providing voice sessions, in particular, to a method for providing voice sessions with a good voice quality in voice sessions between three or more parties.[0003]2. Description of the Related Art[0004]A new communication service called PoC (Push-to-Talk over Cellular) has been attracting attention. The PoC is also referred to as PoC / W (Push-to-Talk over Cellular / Wireless), and is a transceiver-type voice session service that allows two-way conversation Unlike conventional IP (Internet Protocol) phone services, such as a VoIP (Voice over Internet Protocol) service, the PoC has features that the PoC allows a voice packet to be simultaneously transmitted to a plurality of recipients (PoC clients), and allows the recipients to receive voice messages without performing any actions for answering. Due to these features, the PoC service has been attracting interests in numerous fiel...

AI Technical Summary

Benefits of technology

[0008]It is an object of the present invention to provide a call system that allows the voice-packet transmission interval to be changed for each receiver terminal without stopping voice-packet transmission.

[0028]According to the present invention, in a PoC system in which three or more parties attend and perform a voice session, it is possible to adjust a voice-packet transmission interval for each receiver terminal without stopping transmission of the voice packet Thus, it is possible to obtain better voice quality by setting the voice-packet transmission interval corresponding to a reception environment for each receiver terminal.

Problems solved by technology

In either case, it is known that the voice quality deteriorates if the shortening or the extension becomes extreme.

However, the appropriate voice-packet transmission interval momentarily changes depending on factors, such as differences in network characteristics of network systems provided by carriers, differences in transmission directions (uplink / downlink), radio wave conditions, and a degree of congestion.

When one-to-multiple transmission, such as PoC, is performed, the voice-packet transmission interval that is better for a specific call terminal is not necessarily better for other call terminals, since the reception environment of each receiver terminal differs.

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